test(tests): port setUp/tearDown as set_up/tear_down with TearDown

Port PHP setUp/tearDown across the ported integration tests using
same-named set_up()/tear_down() functions and a TearDown struct whose
Drop runs tear_down(). Fixture-init setUp returns its fixtures;
tmpdir-style setUp/tearDown carry state in TearDown fields. Parts that
depend on unported infrastructure (PHPUnit mocks, Config::merge, the PHP
error handler) stay todo!() and are only wired into ignored stubs to
avoid breaking live tests.

Also fix shirabe-php-shim putenv to handle the no-'=' form (PHP unsets
the variable), which Platform::clear_env relies on for the env-clearing
tearDowns.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/crates/shirabe/tests/installer_test.rs b/crates/shirabe/tests/installer_test.rs
index c7d3a91..5e0f941 100644
--- a/crates/shirabe/tests/installer_test.rs
+++ b/crates/shirabe/tests/installer_test.rs
@@ -3,11 +3,30 @@
 // These are large end-to-end installer integration cases driven by fixtures and a mocked
 // Composer/IO/repositories; the full install pipeline (and constraint parsing through a
 // look-around regex) is not ported.
+
+use shirabe::util::platform::Platform;
+
+// The chdir back to prevCwd (cwd management) and removeDirectory of tempComposerHome (a
+// path produced by the unported install pipeline) are not ported; only the env clears are.
+fn tear_down() {
+    Platform::clear_env("COMPOSER_POOL_OPTIMIZER");
+    Platform::clear_env("COMPOSER_FUND");
+}
+
+struct TearDown;
+
+impl Drop for TearDown {
+    fn drop(&mut self) {
+        tear_down();
+    }
+}
+
 macro_rules! stub {
     ($name:ident) => {
         #[test]
         #[ignore = "not yet ported (end-to-end Installer integration over fixtures; constraint parsing uses a look-around regex)"]
         fn $name() {
+            let _tear_down = TearDown;
             todo!()
         }
     };